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Mayarco — Saint-Jean-de-Luz

Latest result (29/09/2026): 80 cells/L — Low

Water quality

Monitoring of the Ostreopsis micro-algae: samples, history and reports.

Concentration trends

Logarithmic scale. Zero values and "below detection threshold" values cannot be plotted on this scale (see the full table below). Dark red dots indicate a beach closure.

Approved testimonials

30
  • 🌊 Open-water swimming (Less than 30 min) on 16/08/2026 · symptoms on 16/08/2026🟢 Mild
    😷 Cough💪 Muscle aches🤢 Nausea
  • 🏊 Swimming (30 min to 1 h) on 16/08/2026 · symptoms on 16/08/2026🔴 Severe
    😷 Cough🫁 Breathing difficulty
  • 🏊 Swimming (More than 3 h) on 13/08/2026 · symptoms on 14/08/2026🟠 Moderate
    🌡️ Fever / chills😷 Cough🤢 Nausea
  • 🚶 Walk along the seashore (Less than 30 min) on 11/08/2026 · symptoms on 11/08/2026🔴 Severe
    😷 Cough👁️ Irritated eyes🫁 Breathing difficulty
  • 🏄 Surfing (1 h to 3 h) on 09/08/2026 · no symptoms
  • 🌊 Open-water swimming (More than 3 h) on 05/08/2026 · symptoms on 06/08/2026🟠 Moderate
    💪 Muscle aches
  • 🏊 Swimming (More than 3 h) on 04/08/2026 · symptoms on 05/08/2026🔴 Severe
    🤢 Nausea💫 Dizziness
  • 🏊 Swimming (Less than 30 min) on 04/08/2026 · no symptoms
  • 🚶 Walk along the seashore (Less than 30 min) on 01/08/2026 · symptoms on 01/08/2026🟠 Moderate
    🤕 Headache
  • 🏊 Swimming (1 h to 3 h) on 28/07/2026 · symptoms on 29/07/2026🟠 Moderate
    🤢 Nausea🌡️ Fever / chills
  • 🏊 Swimming (1 h to 3 h) on 29/07/2026 · symptoms on 29/07/2026🔴 Severe
    🫁 Breathing difficulty
  • 🌊 Open-water swimming (30 min to 1 h) on 28/07/2026 · no symptoms
  • 🌊 Open-water swimming (1 h to 3 h) on 26/07/2026 · no symptoms
  • 🌊 Open-water swimming (1 h to 3 h) on 20/07/2026 · symptoms on 20/07/2026🔴 Severe
    💪 Muscle aches🩹 Skin irritation🤮 Digestive problems (gastro)
  • 🌊 Open-water swimming (Less than 30 min) on 20/07/2026 · no symptoms
  • 🌊 Open-water swimming (1 h to 3 h) on 19/07/2026 · no symptoms
  • 🏊 Swimming (1 h to 3 h) on 19/07/2026 · no symptoms
  • 🌊 Open-water swimming (Less than 30 min) on 18/07/2026 · symptoms on 18/07/2026🔴 Severe
    😷 Cough👁️ Irritated eyes🤮 Digestive problems (gastro)
  • 🏄 Surfing (More than 3 h) on 17/07/2026 · no symptoms
  • 🏊 Swimming (1 h to 3 h) on 14/07/2026 · symptoms on 14/07/2026🟠 Moderate
    👃 Throat / nose irritation😷 Cough🩹 Skin irritation
  • 🚶 Walk along the seashore (30 min to 1 h) on 12/07/2026 · symptoms on 12/07/2026🟠 Moderate
    ❓ Other
  • 🏊 Swimming (30 min to 1 h) on 12/07/2026 · symptoms on 12/07/2026🟠 Moderate
    😷 Cough
  • 🌊 Open-water swimming (More than 3 h) on 10/07/2026 · no symptoms
  • 🏊 Swimming (1 h to 3 h) on 05/07/2026 · symptoms on 07/07/2026🔴 Severe
    🌡️ Fever / chills
  • 🌊 Open-water swimming (1 h to 3 h) on 05/07/2026 · no symptoms
  • 🚶 Walk along the seashore (1 h to 3 h) on 03/07/2026 · symptoms on 05/07/2026🟠 Moderate
    🤕 Headache
  • 🏄 Surfing (30 min to 1 h) on 05/07/2026 · symptoms on 05/07/2026🔴 Severe
    😷 Cough🫁 Breathing difficulty
  • 🏊 Swimming (1 h to 3 h) on 03/07/2026 · symptoms on 04/07/2026🟢 Mild
    👁️ Irritated eyes🫁 Breathing difficulty🩹 Skin irritation
  • 🏊 Swimming (More than 3 h) on 03/07/2026 · no symptoms
  • 🌊 Open-water swimming (More than 3 h) on 01/07/2026 · symptoms on 02/07/2026🔴 Severe
    👁️ Irritated eyes

Testimonials are anonymous and shown after moderation. Correlation does not imply causation.

Full sampling history

SampleResultCells/LsiamensisovataTemp.Status
28/09/202629/09/2026800%100%22°CLow
21/09/202622/09/20264800%100%21.7°CLow
14/09/202615/09/20261603%97%22°CLow
09/09/202610/09/20261200%100%22.8°CLow
07/09/202608/09/20261601%99%23.6°CLow
02/09/202603/09/20261201%99%22.7°CLow
31/08/202601/09/2026880—100%23.4°CLow
26/08/202627/08/2026400—100%23.3°CLow
25/08/202626/08/2026400—100%23.3°CLow
24/08/202625/08/20263604%96%24°CLow
19/08/202620/08/202680—100%25°CLow
17/08/202618/08/20263201%100%25°CLow
15/08/202616/08/20261 5601%100%25.2°CLow
14/08/202615/08/20261 040—100%25.5°CLow
12/08/202613/08/202611 6001%99%25.4°CModerate
10/08/202611/08/20262800%100%24.4°CLow
05/08/202606/08/202600%100%24.7°CUndetectable
03/08/202604/08/2026800%100%24.8°CLow
29/07/202630/07/2026< 403%97%24.8°CUndetectable
27/07/202628/07/20264038%62%24.5°CLow
22/07/202623/07/20261600%100%25.3°CLow
20/07/202621/07/20266000%100%25.8°CLow
17/07/202618/07/20262 040——25.2°CLow
15/07/202616/07/20265 3600%100%25.9°CLow
14/07/202615/07/20262 560—100%25.3°CLow
13/07/202614/07/20266 6402%98%25.6°CLow
09/07/202610/07/2026560———Low
08/07/202609/07/202664010%90%25.2°CLow
06/07/202607/07/2026805%95%25.5°CLow
02/07/202603/07/20263204%96%23.4°CLow
01/07/202602/07/2026< 401%100%23.6°CUndetectable
29/06/202630/06/20262003%97%24.4°CLow
26/06/202627/06/202640—100%24.6°CLow
24/06/202625/06/20260——25.4°CUndetectable
22/06/202623/06/20260——24.2°CUndetectable
17/06/202618/06/20260——21.8°CUndetectable
15/06/202616/06/20260——22.2°CUndetectable
08/06/202609/06/202640——19.6°CLow
01/06/202602/06/20260——20.1°CUndetectable

The beach

Tides, daylight and practical information — unrelated to water quality.

Practical information

Plage de sable fin, accessible facielement depuis les campings du quartier Acotz. Baignade surveillée tous les jours de juillet et août.(Description available in French only.)

🛟 Lifeguarded swimming· 11:00–19:00Sand440 m of beach♿ Limited wheelchair access

Nearby

🅿️ Car park🚻 Toilets🚿 Showers🚰 Drinking water🍽️ Food and drink

View this beach on OpenStreetMap — General information © OpenStreetMap contributors (ODbL)

Data sources

  • Official samples: Communauté d'Agglomération Pays Basque (CAPB) — the only ones used for status and closures.
  • Tides: Open-Meteo forecasts (indicative).
  • General beach information: OpenStreetMap contributors (ODbL) — may be incomplete or out of date.